Double-tube toothpaste capable of ensuring balanced extrusion of two paste bodies

Abstract

The invention discloses double-tube toothpaste capable of ensuring balanced extrusion of two paste bodies. The double-tube toothpaste comprises concentric circle double tubes and the paste bodies in the double tubes, the concentric circle double-tube comprises an inner tube and an outer tube; the inner pipe comprises an inner pipe body and an inner pipe nozzle; the outer pipe comprises an outer pipe body and an outer pipe nozzle; the viscosity of the paste in the inner tube and the outer tube is 103 to 992 Pa.s; the density of the paste in the inner tube and the outer tube is 1.10-1.61 g / cm < 3 >; the diameter ratio of the outer tube to the inner tube in the double-tube toothpaste is 1.2-1.6; the stiffness of the outer tube and the inner tube in the double-tube toothpaste is 3N-15N. When the double-tube toothpaste disclosed by the invention is manually squeezed, the two squeezed paste bodies can be kept balanced each time.

Description

Technical Field

[0001] The invention relates to the technical field of oral care, in particular to a double-tube toothpaste capable of ensuring balanced extrusion of two pastes. Background Art

[0002] Toothpaste is a common cleaning product in daily life and has a long history. With the continuous development of science and technology in toothpaste preparation and the continuous improvement and perfection of process equipment, various types of toothpaste have been launched one after another, and the quality and grade of products have been continuously improved. Now toothpaste varieties have developed from a single cleaning toothpaste to a full range of multifunctional toothpastes with various functions and hundreds of brands, meeting the needs of different levels of consumption.

[0003] Most toothpaste products currently on the market are filled with a single hose, and a hose container can only be filled with one paste. A single paste sometimes cannot achieve more product functions. Therefore, double-tube toothpaste has appeared in the prior art, such as concentric double tubes, where different pastes are stored in the inner tube and the outer tube of the double tube. When used, the tube body is squeezed to squeeze out the pastes in the inner tube and the outer tube at the same time. In this way, the two-phase paste can be squeezed out at the same time when used, but there is often a problem of uneven distribution of the two extruded pastes. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a double-tube toothpaste capable of ensuring balanced extrusion of two pastes. When the double-tube toothpaste is squeezed manually, the two pastes squeezed out can be ensured to be balanced every time.

[0005] The terms "balanced extrusion" and "maintaining balance" have the same meaning, and ordinary technicians in this field usually use the data of the term "uniformity" to determine it. When the uniformity is ≧50%, it is usually identified as "maintaining balance" or "balanced extrusion".

[0006] In order to solve the above technical problems, the invention adopts the following technical solutions :

[0007] A double-tube toothpaste capable of ensuring balanced extrusion of two pastes, comprising concentric double tubes and pastes in double tubes;

[0008] The concentric double tubes include an inner tube and an outer tube;

[0009] The inner tube comprises an inner tube body and an inner tube nozzle;

[0010] The outer tube comprises an outer tube body and an outer tube nozzle;

[0011] The viscosity of the paste in the inner tube and the outer tube is 103-992 Pa·s;

[0012] The paste density in the inner tube and the outer tube is 1.10-1.61 g / cm 3;

[0013] The diameter ratio of the outer tube to the inner tube in the double-tube toothpaste is 1.2-1.6;

[0014] The stiffness of the outer tube and the inner tube of the double-tube toothpaste is 3N-15N.

[0015] As an embodiment, the paste viscosity in the double-tube toothpaste is 331-823 Pa·s.

[0016] As an embodiment, the viscosity difference of the paste in the outer tube and the inner tube is 0-500; preferably, the viscosity difference of the paste in the outer tube and the inner tube is 0-330 Pa·s.

[0017] As an embodiment, the paste density in the double tube toothpaste is 1.38-1.50 g / cm 3 .

[0018] As an embodiment, the density difference between the paste in the outer tube and the inner tube is -0.51-0.51 g / cm 3 Preferably, the density difference between the outer tube and the inner tube is 0-0.51 g / cm 3 More preferably, the density difference between the outer tube and the inner tube is 0-0.40 g / cm 3 .

[0019] As an embodiment, the diameter ratio of the outer tube to the inner tube in the double-tube toothpaste is 1.2-1.4.

[0020] As an embodiment, the double-tube toothpaste tube has a stiffness of 3-15N.

[0021] As an embodiment, the inner tube and the outer tube of the concentric double tube have the same or different tube stiffness, and preferably the inner tube has a higher tube stiffness than the outer tube.

[0022] As an embodiment, the concentric double tube material contains 0-65 wt% high density polyethylene, preferably 5-60%.

[0023] As an embodiment, the difference in the content of high-density polyethylene in the outer tube and the inner tube is -60 to 60%, preferably -5 to 40%, and more preferably 0 to 40%.

[0024] Any range described in the present invention includes the end value and any numerical value between the end values ​​and any sub-range formed by the end value or any numerical value between the end values.

[0025] Unless otherwise specified, all raw materials in the present invention can be purchased from the market, and the equipment used in the present invention can adopt conventional equipment in the relevant field or refer to the existing technology in the relevant field.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] When the double-tube toothpaste of the present invention is squeezed manually, the two pastes squeezed out can ensure that they are balanced every time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the double-tube toothpaste structure of the present invention.

[0029] Figure 2 It is a structural schematic diagram of one of the outlets of the outer tube nozzle and the inner tube nozzle of the double-tube toothpaste of the present invention;

[0030] Figure 3 The present invention is a schematic diagram of the structure of the outer tube nozzle and the inner tube nozzle outlet of the double-tube toothpaste. DETAILED DESCRIPTION

[0031] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0032] Unless otherwise specified, all percentages and ratios used herein are based on the weight of the total composition. Unless otherwise specified, the percentages, ratios and amounts of all ingredients mentioned herein are based on the actual amount of the ingredient, and do not include solvents, fillers or other substances that can be combined with these ingredients in commercial products.

[0033] The term "comprising" herein means that other steps and ingredients which do not affect the end result can be added.

[0034] The term "preferably" and its variants herein refer to embodiments of the present invention that can provide specific beneficial effects under specific circumstances. However, other embodiments may also be preferred under the same or other environments. In addition, the detailed description of one or more preferred embodiments does not mean that other embodiments are useless, and is not intended to exclude other embodiments in the scope of the present invention.

[0035] If no specific conditions are specified in the examples of the present invention, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer; if no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0036] See also Figure 1-Figure 3 As shown, as one aspect of the present invention, a double-tube toothpaste capable of ensuring balanced extrusion of two pastes comprises concentric double tubes and pastes in the double tubes;

[0037] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0038] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0039] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22;

[0040] The paste viscosity in the double-tube toothpaste is 103-992 Pa·s;

[0041] The paste density in the double-tube toothpaste is 1.10-1.61 g / cm 3 ;

[0042] The diameter ratio of the outer tube to the inner tube in the double-tube toothpaste is 1.2-1.6;

[0043] The stiffness of the outer tube and the inner tube of the double-tube toothpaste is 3N-15N.

[0044] Concentric double tube

[0045] See also Figure 1-Figure 3 As shown, the concentric double tube used in the present application, the concentric double tube 100 comprises an inner tube 10 and an outer tube 20;

[0046] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0047] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22;

[0048] The inner tube 10 and the outer tube 20 are respectively filled with pastes of different phases and sealed by clamping the tails; when in use, the sealed tails are squeezed to squeeze out the pastes of the inner tube 10 and the outer tube 20 at the same time.

[0049] It should be noted that see Figure 2 and Figure 3 As shown, at the openings of the outer tube nozzle 22 and the inner tube nozzle 12, the cross-sectional area through which the paste passes can be controlled by setting the number and size of uniform small holes 23 on the outer tube nozzle 22, and the ratio of the cross-sectional areas determines the volume ratio of the inner tube paste and the outer tube paste when the paste is extruded.

[0050] In certain embodiments of the present invention, the cross-sectional areas of the outer tube and the inner tube nozzles are 3:1-1:3, such as but not limited to 2:1-1:3, 1:1-1:3, 3:1-1:2, 3:1-1:1.

[0051] In certain embodiments of the present invention, the concentric double tube material contains high-density polyethylene, wherein the content of high-density polyethylene accounts for 0-65% of the tube, for example but not limited to 0-60%, 0-40%, 0-20%, 0-5%, 5-65%, 5-60%, 5-40%, 5-20%, 20-65%, 20-60%, 20-40%, 40-65%, 40-60%.

[0052] In certain embodiments of the present invention, the difference in high-density polyethylene content between the outer and inner tube materials of the concentric double tubes is -60-60%, for example but not limited to -40-60%, -15-60%, -5-60%, 0-60%, 15-60%, 40-60%, -60-40%, -40-40%, -40-40%, -15-40%, -5-40%, 0-40%, 15-40%, -60-15%, -40-15%, -15-15%, 0-15%, -60-0%, -40-0%, -15-0%, -60--15%, -40--15%, -60--45%.

[0053] Diameter ratio of concentric double tubes

[0054] The present invention unexpectedly discovered that the diameter ratio of the outer tube and the inner tube in a double-tube toothpaste has an impact on whether the two pastes can be evenly squeezed out of the double-tube toothpaste; the diameter ratio refers to the diameter ratio.

[0055] In certain embodiments of the present invention, the diameter ratio of the outer tube to the inner tube is 1.2-1.6, for example but not limited to 1.2-1.5, 1.2-1.4, 1.2-1.3, 1.3-1.6, 1.3-1.5, 1.3-1.4, 1.4-1.6, 1.4-1.5.

[0056] Stiffness of concentric double tubes

[0057] Stiffness is an important indicator of double-tube pipes. The stiffness refers to the pressing force required when the composite pipe is made into an empty tube or a tube sleeve (without a cover or a tube shoulder) and the empty tube is pressed to 1 / 2 of the diameter.

[0058] In certain embodiments of the present invention, the inner tube of the concentric double tube has a higher stiffness than the outer tube. The present invention unexpectedly found that the stiffness of the inner tube and the outer tube has an impact on whether the two pastes can be evenly squeezed out of the double tube toothpaste.

[0059] In certain embodiments of the present invention, the stiffness of the concentric double-tube pipe is 3-15N, for example, but not limited to 3-12N, 3-9N, 3-7N, 3-5N, 5-15N, 5-12N, 5-9N, 5-7N, 7-15N, 7-12N, 7-9N, 9-15N, 9-12N.

[0060] In certain embodiments of the present invention, the outer tube and the inner tube of the concentric double tube have the same stiffness.

[0061] In certain embodiments of the present invention, the outer tube and the inner tube of the concentric double tube have different stiffnesses.

[0062] In certain embodiments of the present invention, the inner tube of the concentric double tube has a higher stiffness than the outer tube.

[0063] Paste viscosity

[0064] The present invention unexpectedly discovered that the viscosity of the pastes in the inner tube and the outer tube has a significant impact on whether the two pastes can be evenly squeezed out of the double-tube toothpaste.

[0065] In certain embodiments of the present invention, the paste viscosity in the double-tube toothpaste is 103-992 Pa·s; more preferably 331-823 Pa·s.

[0066] In some embodiments of the present invention, the viscosity difference between the paste in the outer tube and the paste in the inner tube is 0-500; preferably, the viscosity difference between the paste in the outer tube and the paste in the inner tube is 0-330 Pa·s.

[0067] Paste density

[0068] The present invention unexpectedly discovered that the density of the pastes in the inner tube and the outer tube has a significant impact on whether the two pastes can be evenly squeezed out of the double-tube toothpaste.

[0069] In certain embodiments of the present invention, the density of the paste in the double-tube toothpaste is 1.38-1.50 g / cm 3 .

[0070] In some embodiments of the present invention, the density difference between the paste in the outer tube and the inner tube is -0.51-0.51 g / cm 3 Preferably, the density difference between the outer tube and the inner tube is 0-0.51 g / cm 3 .

[0071] In certain preferred embodiments of the present invention, the density difference between the paste in the outer tube and the inner tube is 0-0.40 g / cm 3 .

[0072] Evaluation method for extrusion uniformity of two pastes of double-tube toothpaste in the present invention

[0073] 1) Evaluation team establishment

[0074] 60 qualified sensory assessors were selected with reference to GB / T 16291.1-1512 and GB / T12311-1512;

[0075] 2) Sample evaluation

[0076] Take a double tube of toothpaste respectively, squeeze the double tubes 100 times to obtain 100 pastes, and have the evaluators evaluate the number of evenly distributed pastes in the double tubes among the 100 pastes, calculate the uniformity, and calculate the average of the uniformity rates recognized by the 60 evaluators. Specific embodiments

[0078] Examples 1-5, Comparative Examples 1-2

[0079] A double-tube toothpaste 100 capable of ensuring balanced extrusion of two pastes, comprising concentric double tubes and pastes in the double tubes;

[0080] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0081] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0082] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to the outlet cross-sectional area of ​​the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as the outlet cross-sectional area of ​​the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out the same volume of paste;

[0083] The high-density polyethylene content of the outer and inner tube materials is 40%;

[0084] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0085] The stiffness of the inner and outer pipes is 7N;

[0086] The paste density in the inner tube and the outer tube is 1.1 g / cm 3 ;

[0087] According to the different viscosities of the pastes in the inner and outer tubes, different embodiments and comparative examples are obtained, as shown in Table 1 below:

[0088] Table 1:

[0089] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Viscosity (Pa·s) 103 331 670 823 992 75 1087

[0090] The double-tube toothpastes of the above-mentioned embodiment and comparative example were evaluated using the "evaluation method for the extrusion uniformity of two pastes of double-tube toothpaste" of the present invention, and the results are shown in Table 2 below:

[0091] Table 2:

[0092] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Uniformity (%) 66.7 82.3 84.5 79.6 72 36.7 25.3

[0093] It can be seen from Table 2 that, under the same other conditions, different paste viscosities have a greater impact on the extrusion uniformity of the double-tube toothpaste of the present invention, as follows:

[0094] 1) When the paste viscosity is 75 Pa·s, the extrusion uniformity of the double-tube toothpaste is only 36.7%;

[0095] 2) When the paste viscosity is 103Pa·s, the extrusion uniformity of the double-tube toothpaste is only 66.7%;

[0096] 3) When the paste viscosity is 331 Pa·s, the extrusion uniformity of the double-tube toothpaste reaches 82.3%;

[0097] 4) When the paste viscosity is 670 Pa·s, the extrusion uniformity of the double-tube toothpaste reaches 84.5%;

[0098] 5) When the paste viscosity is 823 Pa·s, the extrusion uniformity of the double-tube toothpaste reaches 79.6%;

[0099] 6) When the paste viscosity is 992 Pa·s, the extrusion uniformity of the double-tube toothpaste is 72.0%;

[0100] 7) When the paste viscosity is 1087 Pa·s, the extrusion uniformity of the double-tube toothpaste is only 25.3%;

[0101] In summary, when the paste viscosity in the double-tube toothpaste is ≦75Pa·s, the extrusion uniformity of the double-tube toothpaste will decrease significantly (<37%); when the paste viscosity in the double-tube toothpaste is ≧1087Pa·s, the extrusion uniformity of the double-tube toothpaste will also decrease significantly and drastically (<26%); when the paste viscosity in the double-tube toothpaste is between 103-992Pa·s, the extrusion uniformity of the double-tube toothpaste will increase significantly (>66%); especially when the paste viscosity in the double-tube toothpaste is between 331-823Pa·s, the extrusion uniformity of the double-tube toothpaste will increase more significantly (>79%).

[0102] Examples 6-8, Comparative Examples 3-4

[0103] A double-tube toothpaste capable of ensuring balanced extrusion of two pastes, comprising concentric double tubes and pastes in double tubes;

[0104] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0105] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0106] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to the outlet cross-sectional area of ​​the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as the outlet cross-sectional area of ​​the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out the same volume of paste;

[0107] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0108] The high-density polyethylene content of the outer and inner tube materials is 40%;

[0109] The stiffness of the inner and outer pipes is 7N;

[0110] The viscosity of the paste in the inner and outer tubes of the double-tube toothpaste is 331 Pa·s.

[0111] According to the different densities of the pastes in the inner and outer tubes, different embodiments and comparative examples are obtained, as shown in the following Table 3. For the sake of convenience, Example 2 is also included in Table 3:

[0112] Table 3:

[0113] Example 2 Example 6 Example 7 Example 8 Comparative Example 3 Comparative Example 4 <![CDATA[Density (g / cm 3 )]]> 1.10 1.38 1.50 1.61 1.05 1.73

[0114] The double-tube toothpastes of the above-mentioned embodiment and comparative example were evaluated using the "evaluation method for the extrusion uniformity of two pastes of double-tube toothpaste" of the present invention, and the results are shown in Table 4 below:

[0115] Table 4

[0116] Example 2 Example 6 Example 7 Example 8 Comparative Example 3 Comparative Example 4 Uniformity (%) 82.3 89.8 86.3 75.5 43.2 33.8

[0117] It can be seen from Table 4 that, under the same other conditions, different paste viscosities have a greater impact on the extrusion uniformity of the double-tube toothpaste of the present invention, as follows:

[0118] 1) When the paste density is 1.05g / cm 3 When the toothpaste is squeezed out, the uniformity of the double-tube toothpaste is only 43.2%;

[0119] 2) When the paste density is 1.10g / cm 3 When the double-tube toothpaste is squeezed out, the uniformity rate reaches 82.3%;

[0120] 3) When the paste density is 1.38g / cm 3 When the double-tube toothpaste is squeezed out, the uniformity reaches 89.8%;

[0121] 4) When the paste density is 1.50g / cm 3 When the double-tube toothpaste is squeezed out, the uniformity reaches 86.3%;

[0122] 5) When the paste density is 1.61g / cm 3 When the double-tube toothpaste is squeezed out, the uniformity reaches 75.5%;

[0123] 6) When the paste density is 1.73g / cm 3 When the double-tube toothpaste is squeezed out, the uniformity is only 33.8%;

[0124] In summary, when the paste density in the double-tube toothpaste is ≤1.05g / cm 3 , the extrusion uniformity of the double-tube toothpaste will decrease significantly (<44%); when the paste density in the double-tube toothpaste is ≧1.73g / cm 3 When the density of the paste in the double-tube toothpaste is between 1.10-1.61 g / cm 3 When the extrusion uniformity of the double-tube toothpaste is significantly improved (>75%), especially when the paste density of the double-tube toothpaste is 1.38-1.50g / cm 3 When the toothpaste is squeezed out of the tube, the extrusion uniformity of the double-tube toothpaste will be significantly improved (>86%).

[0125] Examples 9-15

[0126] A double-tube toothpaste capable of ensuring balanced extrusion of two pastes, comprising concentric double tubes and pastes in double tubes;

[0127] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0128] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0129] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to the outlet cross-sectional area of ​​the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as the outlet cross-sectional area of ​​the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out the same volume of paste;

[0130] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0131] The high-density polyethylene content in the outer tube and inner tube materials is 40%;

[0132] The inner tube and the outer tube have a material stiffness of 7N;

[0133] The density of the paste in the inner and outer tubes of the double-tube toothpaste is 1.10 g / cm 3 .

[0134] According to the difference in viscosity between the paste in the outer tube and the inner tube of the double-tube toothpaste, Examples 9-15 were obtained, as shown in Table 5 below. For convenience, Example 3 is also included in Table 5:

[0135] Table 5

[0136]

[0137] The double-tube toothpaste of the above embodiment was evaluated using the "evaluation method for the uniformity of extrusion of two pastes of double-tube toothpaste" of the present invention, and the results are shown in Table 6 below:

[0138] Table 6

[0139] Example 3 Example 9 Example 10 Embodiment 11 Embodiment 13 Embodiment 14 Embodiment 15 Uniformity (%) 84.5 83.3 80.5 75.7 71.4 66.9 63.3

[0140] It can be seen from Table 6 that, under the same other conditions, the difference in viscosity of the paste in the outer tube and the inner tube of the double-tube toothpaste of the present invention has a certain influence on the extrusion uniformity of the double-tube toothpaste, as follows:

[0141] 1) When the viscosity difference between the paste in the outer tube and the inner tube is -492, the extrusion uniformity of the double-tube toothpaste is 63.3%;

[0142] 2) When the viscosity difference between the paste in the outer tube and the inner tube is -329, the extrusion uniformity of the double-tube toothpaste is 66.9%;

[0143] 3) When the viscosity difference between the paste in the outer tube and the inner tube is -153, the extrusion uniformity of the double-tube toothpaste is 71.4%;

[0144] 4) When the viscosity difference between the paste in the outer tube and the inner tube is 0, the extrusion uniformity of the double-tube toothpaste is 84.5%;

[0145] 5) When the viscosity difference between the paste in the outer tube and the inner tube is 153, the extrusion uniformity of the double-tube toothpaste is 83.3%;

[0146] 6) When the viscosity difference between the paste in the outer tube and the inner tube is 329, the extrusion uniformity of the double-tube toothpaste is 80.5%;

[0147] 7) When the viscosity difference between the paste in the outer tube and the inner tube is 492, the extrusion uniformity of the double-tube toothpaste is 75.7%.

[0148] In summary, when the viscosity difference between the paste in the outer tube and the inner tube of a double-tube toothpaste is >-500, the extrusion of the double-tube toothpaste will basically remain balanced (uniformity ≧50%); when the viscosity difference between the paste in the outer tube and the inner tube of a double-tube toothpaste is ≦500, the extrusion uniformity of the double-tube toothpaste will also remain balanced (uniformity ≧63%); that is to say, when the viscosity difference between the paste in the outer tube and the inner tube of a double-tube toothpaste is -500 to 500, the extrusion of the double-tube toothpaste will remain balanced (>50%); especially when the viscosity difference between the paste in the outer tube and the inner tube of a double-tube toothpaste is 0-330, the extrusion uniformity of the double-tube toothpaste will be more significantly improved (uniformity ≧80%).

[0149] Examples 16-21

[0150] A double-tube toothpaste capable of ensuring balanced extrusion of two pastes, comprising concentric double tubes and pastes in double tubes;

[0151] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0152] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0153] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to the outlet cross-sectional area of ​​the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as the outlet cross-sectional area of ​​the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out the same volume of paste;

[0154] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0155] The high-density polyethylene content of the outer and inner tube materials is 40%;

[0156] The inner tube and the outer tube have a material stiffness of 7N;

[0157] The viscosity of the paste in the inner and outer tubes of the double-tube toothpaste is 331 Pa·s.

[0158] According to the different density differences of the paste in the outer tube and the inner tube of the double-tube toothpaste, Examples 16-21 were obtained, as shown in Table 7 below. For convenience, Example 2 is also included in Table 7:

[0159] Table 7

[0160]

[0161] The double-tube toothpaste of the above embodiment was evaluated using the "evaluation method for the extrusion uniformity of two pastes of double-tube toothpaste" of the present invention, and the results are shown in Table 8 below:

[0162] Table 8

[0163] Example 2 Example 16 Embodiment 17 Embodiment 18 Embodiment 19 Embodiment 20 Embodiment 21 Uniformity (%) 82.3 85 86.7 78.5 71.6 67.7 64.3

[0164] It can be seen from Table 8 that, under the same other conditions, the difference in paste density between the outer tube and the inner tube of the double-tube toothpaste of the present invention has a certain influence on the extrusion uniformity of the double-tube toothpaste, as follows:

[0165] 1) When the density difference between the outer tube and the inner tube is -0.51, the extrusion uniformity of the double-tube toothpaste is 64.3%;

[0166] 2) When the density difference between the outer tube and the inner tube is -0.40, the extrusion uniformity of the double-tube toothpaste is 67.7%;

[0167] 3) When the density difference between the outer tube and the inner tube is -0.28, the extrusion uniformity of the double-tube toothpaste is 71.6%;

[0168] 4) When the density difference between the outer tube and the inner tube is 0, the extrusion uniformity of the double-tube toothpaste is 82.3%;

[0169] 5) When the density difference between the outer tube and the inner tube is 0.28, the extrusion uniformity of the double-tube toothpaste is 85.0%;

[0170] 6) When the density difference between the outer tube and the inner tube is 0.40, the extrusion uniformity of the double-tube toothpaste is 86.7%;

[0171] 7) When the density difference between the paste in the outer tube and the inner tube is 0.51, the extrusion uniformity of the double-tube toothpaste is 78.5%.

[0172] In summary, when the difference in paste density between the outer tube and the inner tube of a double-tube toothpaste is ≦-0.28, the extrusion uniformity of the double-tube toothpaste will be significantly reduced; when the difference in paste density between the outer tube and the inner tube of a double-tube toothpaste is ≧0.51, the extrusion uniformity of the double-tube toothpaste will also be significantly reduced; that is, when the difference in paste density between the outer tube and the inner tube of a double-tube toothpaste is 0-0.51, the extrusion uniformity of the double-tube toothpaste will be significantly improved; especially when the difference in paste density between the outer tube and the inner tube of a double-tube toothpaste is 0-0.40, the extrusion uniformity of the double-tube toothpaste will be more significantly improved. In general, when the difference in paste density between the outer tube and the inner tube is in the range of -0.51 to 0.51, although it will affect the extrusion uniformity of the double-tube toothpaste, it will not lead to uneven extrusion (uniformity <50%).

[0173] Examples 22-23, Comparative Examples 5-6

[0174] A double-tube toothpaste capable of ensuring balanced extrusion of two pastes, comprising concentric double tubes and pastes in double tubes;

[0175] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0176] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0177] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to the outlet cross-sectional area of ​​the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as the outlet cross-sectional area of ​​the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out the same volume of paste;

[0178] The inner tube and the outer tube have a material stiffness of 7N;

[0179] The high-density polyethylene content of the outer and inner tube materials is 40%;

[0180] The density of the paste in the inner and outer tubes of the double-tube toothpaste is 1.1 g / cm 3 .

[0181] The viscosity of the paste in the inner and outer tubes of the double-tube toothpaste is 331 Pa·s.

[0182] According to the different diameter ratios of the outer tube and the inner tube of the double-tube toothpaste, Examples 22-23 and Comparative Examples 5-6 are obtained, as shown in Table 9 below. For convenience, Example 2 is also included in Table 9:

[0183] Table 9

[0184] Example 2 Embodiment 22 Embodiment 23 Comparative Example 5 Comparative Example 6 Outer pipe diameter / Inner pipe diameter 1.4 1.2 1.6 1.1 1.7

[0185] The double-tube toothpaste of the above embodiment was evaluated using the "evaluation method for the extrusion uniformity of two pastes of double-tube toothpaste" of the present invention, and the results are shown in Table 10 below:

[0186] Table 10

[0187] Example 2 Embodiment 22 Embodiment 23 Comparative Example 5 Comparative Example 6 Uniformity (%) 82.3 86.3 76.5 42.0 40.3

[0188] It can be seen from Table 10 that, under the same other conditions, the different diameter ratios of the outer tube and the inner tube of the double-tube toothpaste of the present invention have a greater impact on the extrusion uniformity of the double-tube toothpaste, as follows:

[0189] 1) When the diameter ratio of the outer tube to the inner tube is 1.1, the extrusion uniformity of the double-tube toothpaste is 42.0%;

[0190] 2) When the diameter ratio of the outer tube to the inner tube is 1.2, the extrusion uniformity of the double-tube toothpaste is 86.3%;

[0191] 3) When the diameter ratio of the outer tube to the inner tube is 1.4, the extrusion uniformity of the double-tube toothpaste is 82.3%;

[0192] 4) When the diameter ratio of the outer tube to the inner tube is 1.6, the extrusion uniformity of the double-tube toothpaste is 76.5%;

[0193] 5) When the diameter ratio of the outer tube to the inner tube is 1.7, the extrusion uniformity of the double-tube toothpaste is 40.3%;

[0194] In summary, when the diameter ratio of the outer tube and the inner tube in the double-tube toothpaste is ≦1.1, the extrusion uniformity of the double-tube toothpaste will be significantly reduced; when the diameter ratio of the outer tube and the inner tube in the double-tube toothpaste is ≧1.7, the extrusion uniformity of the double-tube toothpaste will also be significantly reduced (uniformity ≦40.3%); that is to say, when the diameter ratio of the outer tube and the inner tube in the double-tube toothpaste is 1.2-1.6, the extrusion uniformity of the double-tube toothpaste will be significantly improved (uniformity ≧76.5%); especially when the diameter ratio of the outer tube and the inner tube in the double-tube toothpaste is 1.2-1.4, the extrusion uniformity of the double-tube toothpaste will be more significantly improved (uniformity ≧82.3%).

[0195] Examples 24-25, Comparative Examples 7-8

[0196] A double-tube toothpaste capable of ensuring balanced extrusion of two pastes, comprising concentric double tubes and pastes in double tubes;

[0197] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0198] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0199] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to the outlet cross-sectional area of ​​the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as the outlet cross-sectional area of ​​the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out the same volume of paste;

[0200] The diameter ratio of the outer tube to the inner tube is 1.4;

[0201] The high-density polyethylene content of the outer and inner tube materials is 40%;

[0202] The density of the paste in the inner and outer tubes of the double-tube toothpaste is 1.1 g / cm 3 .

[0203] The viscosity of the paste in the inner and outer tubes of the double-tube toothpaste is 331 Pa·s.

[0204] According to the different stiffness of the outer tube and the inner tube of the double-tube toothpaste, Examples 24-25 and Comparative Examples 7-8 were obtained, as shown in Table 11 below. For convenience, Example 2 is also included in Table 11 below:

[0205] Table 11

[0206] Example 2 Embodiment 24 Embodiment 25 Comparative Example 7 Comparative Example 8 Outer tube stiffness (N) 7 3 15 2 17 Inner tube stiffness (N) 7 3 15 2 17

[0207] The double-tube toothpaste of the above embodiment was evaluated using the "evaluation method for the extrusion uniformity of two pastes of double-tube toothpaste" of the present invention, and the results are shown in Table 12 below:

[0208] Table 12

[0209] Example 2 Embodiment 24 Embodiment 25 Comparative Example 7 Comparative Example 8 Uniformity (%) 82.3 73.4 71.8 31.5 42.7

[0210] It can be seen from Table 12 that, under the same other conditions, the difference in stiffness between the outer tube and the inner tube of the double-tube toothpaste of the present invention has a greater impact on the extrusion uniformity of the double-tube toothpaste, as follows:

[0211] 1) When the stiffness of the outer tube and the inner tube is 2N, the extrusion uniformity of the double-tube toothpaste is 31.5%;

[0212] 2) When the stiffness of the outer tube and the inner tube are both 3N, the extrusion uniformity of the double-tube toothpaste is 73.4%;

[0213] 3) When the stiffness of the outer tube and the inner tube is 7N, the extrusion uniformity of the double-tube toothpaste is 82.3%;

[0214] 4) When the stiffness of the outer tube and the inner tube are both 15N, the extrusion uniformity of the double-tube toothpaste is 71.8%;

[0215] 5) When the stiffness of the outer tube and the inner tube are both 17N, the extrusion uniformity of the double-tube toothpaste is 42.7%;

[0216] In summary, when the stiffness of the outer tube and the inner tube of the double-tube toothpaste is ≦2N, the extrusion uniformity of the double-tube toothpaste will be significantly reduced; when the stiffness of the outer tube and the inner tube of the double-tube toothpaste is ≧17N, the extrusion uniformity of the double-tube toothpaste will also be significantly reduced; that is to say, when the stiffness of the outer tube and the inner tube of the double-tube toothpaste is 3N-15N, the extrusion uniformity of the double-tube toothpaste will be significantly improved; especially when the stiffness of the outer tube and the inner tube of the double-tube toothpaste is 7N, the extrusion uniformity of the double-tube toothpaste will be more significantly improved.

[0217] Examples 26-28

[0218] A double-tube toothpaste capable of ensuring balanced extrusion of two pastes, comprising concentric double tubes and pastes in double tubes;

[0219] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0220] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0221] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to the outlet cross-sectional area of ​​the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as the outlet cross-sectional area of ​​the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out the same volume of paste;

[0222] The diameter ratio of the outer tube to the inner tube is 1.4;

[0223] The high-density polyethylene content of the outer and inner tube materials is 40%;

[0224] The density of the paste in the inner and outer tubes of the double-tube toothpaste is 1.1 g / cm 3 .

[0225] The viscosity of the paste in the inner and outer tubes of the double-tube toothpaste is 331 Pa·s.

[0226] According to the same outer tube stiffness and different inner tube stiffness of the double-tube toothpaste, Examples 26-28 were obtained, as shown in Table 13 below. For convenience, Example 2 is also included in Table 13:

[0227] Table 13

[0228] Example 2 Embodiment 26 Embodiment 27 Embodiment 28 Outer tube stiffness (N) 7 7 7 7 Inner tube stiffness (N) 7 3 12 15

[0229] The double-tube toothpaste of the above embodiment was evaluated using the "evaluation method for the extrusion uniformity of two pastes of double-tube toothpaste" of the present invention, and the results are shown in Table 14 below:

[0230] Table 14

[0231] Example 2 Embodiment 26 Embodiment 27 Embodiment 28 Uniformity (%) 82.3 67.3 79.8 84.9

[0232] It can be seen from Table 14 that when other conditions are the same and the outer tube stiffness is the same, the difference in the inner tube stiffness has an effect on the extrusion uniformity of the double-tube toothpaste of the present invention, but the effect is not significant, as follows:

[0233] 1) When the outer tube stiffness is 7N and the inner tube stiffness is 3N, the extrusion uniformity of the double-tube toothpaste is 67.3%;

[0234] 2) When the outer tube stiffness is 7N and the inner tube stiffness is 7N, the extrusion uniformity of the double-tube toothpaste is 82.3%;

[0235] 3) When the outer tube stiffness is 7N and the inner tube stiffness is 12N, the extrusion uniformity of the double-tube toothpaste is 79.8%;

[0236] 4) When the outer tube stiffness is 7N and the inner tube stiffness is 15N, the extrusion uniformity of the double-tube toothpaste is 84.9%;

[0237] In summary, when the outer tube stiffness of the double-tube toothpaste is the same at 7N, the change of the inner tube stiffness between 3-15N will affect the extrusion uniformity, but will not lead to uneven extrusion (uniformity <50%).

[0238] Examples 29-31

[0239] A double-tube toothpaste capable of ensuring balanced extrusion of two pastes, comprising concentric double tubes and pastes in double tubes;

[0240] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0241] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0242] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to the outlet cross-sectional area of ​​the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as the outlet cross-sectional area of ​​the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out the same volume of paste;

[0243] The diameter ratio of the outer tube to the inner tube is 1.4;

[0244] The high-density polyethylene content of the outer and inner tube materials is 40%;

[0245] The density of the paste in the inner and outer tubes of the double-tube toothpaste is 1.1 g / cm 3 .

[0246] The viscosity of the paste in the inner and outer tubes of the double-tube toothpaste is 331 Pa·s.

[0247] According to the different outer tube stiffness and the same inner tube stiffness of the double-tube toothpaste, Examples 29-31 were obtained, as shown in Table 15 below. For convenience, Example 2 is also included in Table 15:

[0248] Table 15

[0249] Example 2 Embodiment 29 Embodiment 30 Embodiment 31 Outer tube stiffness (N) 7 3 9 15 Inner tube stiffness (N) 7 7 7 7

[0250] The double-tube toothpaste of the above embodiment was evaluated using the "evaluation method for the extrusion uniformity of two pastes of double-tube toothpaste" of the present invention, and the results are shown in Table 16 below:

[0251] Table 16

[0252] Example 2 Embodiment 29 Embodiment 30 Embodiment 31 Uniformity (%) 82.3 84.6 68.5 65.1

[0253] It can be seen from Table 16 that when other conditions are the same and the outer tube stiffness is the same, the difference in the inner tube stiffness has an effect on the extrusion uniformity of the double-tube toothpaste of the present invention, but the effect is not significant, as follows:

[0254] 1) When the outer tube stiffness is 3N and the inner tube stiffness is 7N, the extrusion uniformity of the double-tube toothpaste is 84.5%;

[0255] 2) When the outer tube stiffness is 7N and the inner tube stiffness is 7N, the extrusion uniformity of the double-tube toothpaste is 82.3%;

[0256] 3) When the outer tube stiffness is 9N and the inner tube stiffness is 7N, the extrusion uniformity of the double-tube toothpaste is 68.5%;

[0257] 4) When the outer tube stiffness is 15N and the inner tube stiffness is 7N, the extrusion uniformity of the double-tube toothpaste is 65.1%;

[0258] That is to say, when the inner tube stiffness of the double-tube toothpaste is the same at 7N, the change of the outer tube stiffness between 3-15N will affect the extrusion uniformity, but will not lead to uneven extrusion (uniformity <50%).

[0259] In summary, when the stiffness of the inner and outer tubes of the concentric double tubes is different, the uniformity of the paste extrusion of the inner and outer tubes is also high, especially when the stiffness of the inner tube is higher than that of the outer tube, the uniformity is further increased.

[0260] Examples 32-36

[0261] The outer tube paste and the inner tube paste are respectively canned in the outer tube and the inner tube of different concentric circle double tubes to obtain Examples 32-36, wherein the concentric circle double tubes have the following characteristics:

[0262] Including concentric double tubes and double tube paste;

[0263] The concentric double tubes include an inner tube 10 and an outer tube 20;

[0264] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0265] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to the outlet cross-sectional area of ​​the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as the outlet cross-sectional area of ​​the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out the same volume of paste;

[0266] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0267] The stiffness of the inner and outer pipes is 7N;

[0268] The viscosity of the paste in the inner and outer tubes of the double-tube toothpaste is 331 Pa·s.

[0269] The difference between the concentric double tubes of different embodiments or comparative examples is that the high-density polyethylene content in the concentric double tube body is different. For the convenience of comparison, the high-density polyethylene content of the concentric tube material of Example 2 is listed in the following Table 17.

[0270] Table 17:

[0271]

[0272] The distribution uniformity of the pastes in the inner and outer tubes of the toothpastes of the above-mentioned embodiments and comparative examples when extruded was evaluated according to the method of the present invention. The results are shown in Table 18 below.

[0273] Table 18:

[0274] Embodiment 32 Embodiment 33 Example 2 Embodiment 34 Embodiment 35 Embodiment 36 Uniformity (%) 72.9 77.2 82.3 85.6 63.8 65.5

[0275] From Table 18 we can see that:

[0276] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 32 is 72.9%;

[0277] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 33 is 77.2%;

[0278] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 2 is 82.3%;

[0279] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 34 is 85.6%;

[0280] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 35 is 63.8%;

[0281] The uniformity of paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 36 is 65.5%.

[0282] From the above, we can know that the content of high-density polyethylene in the concentric double-tube pipe will affect the uniformity of paste extrusion:

[0283] 1) When the content of high-density polyethylene in the concentric double-tube tube is 5%, the uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste is 72.9%;

[0284] 1) When the content of high-density polyethylene in the concentric double-tube tube is 20%, the uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste is 77.2%;

[0285] 2) When the content of high-density polyethylene in the concentric double-tube tube is 40%, the uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste is 82.3%;

[0286] 3) When the content of high-density polyethylene in the concentric double-tube tube is 60%, the uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste is 85.6%;

[0287] 4) When the content of high-density polyethylene in the concentric double-tube tube is 65%, the uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste is reduced to 63.8%;

[0288] 5) When the content of high-density polyethylene in the concentric double-tube tube is 0%, the uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste drops to 65.5%.

[0289] In summary, when the content of high-density polyethylene in the concentric double-tube pipe is 0-65%, the uniformity of the paste extrusion of the inner and outer tubes is higher, especially when the content of high-density polyethylene is 5-60%, the uniformity is higher.

[0290] Examples 37-42

[0291] The outer tube paste and the inner tube paste are respectively canned in the outer tube and the inner tube of different concentric circle double tubes to obtain Examples 37-42, wherein the concentric circle double tubes have the following characteristics:

[0292] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0293] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22;

[0294] The ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle is the same as that of the inner tube nozzle, when squeezing the double tube toothpaste, the outer tube and the inner tube can conveniently squeeze out equal volumes of paste;

[0295] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0296] The stiffness of the inner and outer pipes is 7N.

[0297] The difference between different concentric double tubes is that the difference in high-density polyethylene content in the inner and outer tubes of the concentric double tube is different. For the convenience of comparison, the difference in high-density polyethylene content in the concentric double tube material of Example 34 is listed in Table 19.

[0298] Table 19:

[0299]

[0300] The distribution uniformity of the pastes in the inner and outer tubes of the toothpastes of the above-mentioned embodiments and comparative examples during extrusion was evaluated according to the method of the present invention. The results are shown in Table 20 below.

[0301] Table 20:

[0302] Embodiment 37 Embodiment 38 Embodiment 39 Embodiment 34 Embodiment 40 Embodiment 41 Embodiment 42 Uniformity (%) 79.2 89.3 86.8 85.6 76.4 64.8 60.9

[0303] From Table 20 we can see that:

[0304] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 37 is 79.2%;

[0305] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 38 is 89.3%;

[0306] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 39 is 86.8%;

[0307] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 34 is 85.6%;

[0308] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 40 is 76.4%;

[0309] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 41 is 64.8%;

[0310] The uniformity of the paste extrusion of the inner and outer tubes of the concentric double-tube toothpaste of Example 42 is 60.9%;

[0311] From the above, it can be seen that the difference in the content of high-density polyethylene in the concentric double-tube outer and inner tubes will affect the uniformity of paste extrusion.

[0312] 1) When the difference in the content of high-density polyethylene in the outer and inner tubes of the concentric double tubes is 60%, the uniformity of the paste extrusion of the inner and outer tubes of the concentric double tubes of toothpaste is 79.2%;

[0313] 2) When the difference in high-density polyethylene content in the concentric double-tube outer and inner tubes is 40%, the uniformity of the paste extrusion of the concentric double-tube toothpaste inner and outer tubes is 89.3%, which is much higher than when the content difference is 60%;

[0314] 3) When the difference in the content of high-density polyethylene in the concentric double-tube outer and inner tubes is 15%, the uniformity of the paste extrusion of the concentric double-tube toothpaste inner and outer tubes is 86.8%;

[0315] 4) When the difference in the content of high-density polyethylene in the outer and inner tubes of the concentric double tubes is 0%, the uniformity of the paste extrusion of the inner and outer tubes of the concentric double tubes is 85.6% respectively;

[0316] 5) When the difference in the content of high-density polyethylene in the concentric double-tube outer and inner tubes is -5%, the uniformity of the paste extrusion of the concentric double-tube toothpaste inner and outer tubes is 76.4%.

[0317] 6) When the difference in high-density polyethylene content in the concentric double-tube outer and inner tubes is -15%, the uniformity of the paste extrusion of the concentric double-tube toothpaste inner and outer tubes is still as high as 64.8%. When the content difference is -5%, the uniformity decreases.

[0318] 7) When the difference in high-density polyethylene content in the concentric double-tube outer and inner tubes is -60%, the uniformity of the paste extrusion of the concentric double-tube toothpaste inner and outer tubes is 60.9%, which is basically the same as when the content difference is -15%.

[0319] In summary, when the difference in high-density polyethylene content in the concentric double-tube outer and inner tubes is between -60% and 60%, the uniformity of paste extrusion in the inner and outer tubes is relatively high, but when the content difference is between -5% and 40%, the uniformity is even higher, especially when the content difference is between 0% and 40%, the uniformity is further increased.

[0320] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0321] In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction. The above description is only an embodiment of the embodiment of this specification and is not intended to limit the embodiment of this specification. For those skilled in the art, the embodiment of this specification may have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the embodiment of this specification shall be included in the scope of the claims of the embodiment of this specification.

Claims

1. A double-tube toothpaste capable of ensuring balanced extrusion of two pastes, characterized in that: Including concentric double tubes and double tube paste; The concentric double tubes include an inner tube and an outer tube; The inner tube comprises an inner tube body and an inner tube nozzle; The outer tube comprises an outer tube body and an outer tube nozzle; The viscosity of the paste in the inner tube and the outer tube is 103-992 Pa·s; The paste density in the inner tube and the outer tube is 1.10-1.61 g / cm 3 ; The diameter ratio of the outer tube to the inner tube in the double-tube toothpaste is 1.2-1.6; The stiffness of the outer tube and the inner tube of the double-tube toothpaste is 3N-15N.

2. The double-tube toothpaste according to claim 1, characterized in that: The paste viscosity in the double-tube toothpaste is 331-823 Pa·s.

3. The double-tube toothpaste according to claim 1, characterized in that: The viscosity difference of the paste in the outer tube and the inner tube is 0-500 Pa·s; more preferably, the viscosity difference of the paste in the outer tube and the inner tube is 0-330 Pa·s.

4. The double-tube toothpaste according to claim 1, characterized in that: The density of the paste in the double tube is 1.38-1.50 g / cm 3 .

5. The double-tube toothpaste according to claim 1, characterized in that: The density difference between the paste in the outer tube and the inner tube is -0.51-0.51 g / cm 3 Preferably, the density difference between the outer tube and the inner tube is 0-0.51 g / cm 3 More preferably, the density difference between the outer tube and the inner tube is 0-0.40 g / cm 3 .

6. The double-tube toothpaste according to claim 1, characterized in that: The diameter ratio of the outer tube to the inner tube in the double-tube toothpaste is 1.2-1.

4.

7. The double-tube toothpaste according to claim 1, characterized in that: The stiffness of the outer tube and the inner tube is 3-15N.

8. The concentric double tube toothpaste according to claim 1, characterized in that: The inner tube and the outer tube of the concentric double tube have the same or different tube stiffness, and preferably the inner tube has a higher tube stiffness than the outer tube.

9. The concentric double tube toothpaste according to claim 1, characterized in that: The concentric double tube material contains 0-65 wt% of high density polyethylene, preferably 5-60%.

10. The concentric double tube toothpaste according to claim 1, characterized in that: The difference in high-density polyethylene content between the outer tube and the inner tube is -60 to 60%, preferably -5 to 40%, and more preferably 0 to 40%.

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